the associated press also reporting the fbi wants to look into his background. they want to see precisely what the motivation was. i was speaking to a police officer yesterday. the police often certain was telling me, look, he might have had a run-in at some point at a checkpoint with the tsa at an airport, we don't know. there was also speculation from the officer that perhaps he'd actually applied for a job that he didn't get with the tsa and possibly that he tried signing up for the precheck, which is early security screening, and might have been turned down for that. that was speculation very much at the time. the fbi is searching his apartment today. it is unclear at this time if anything they found at all. but local officials saying that this actually could have been an awful lot worse and the tsa was so swift to react when the gunman actually entered the airport. take a listen. >> we bore witness to heroism at this airport. when shots rang out, members of the police department ran towards that gunfire, without regard to their own safety or well being. the